Elements of Trommel Dynamics: Determination of the Dynamic Bulk Density - a Working Paper

摘要

The main problem in trommel dynamics is to relate the size and density properties of the feedstock, the geometric and dynamic parameters of the device (rotary screen), the elementary and cumulative probabilities of screening, so as to allow engineering design and/or predictions of operating performances. A procedure is proposed for the determination of the bulk density of the burden in the trommel, under actual dynamical conditions of use. It is obvious that whenever a trommel has to be sized for an actual mass throughput of a given feedstock, the relationship between mass and volume flow rate should be characterized by a bulk density of the material. It is known from experimental observations that the material resting on the barrel between two consecutive phases of flight is generally fluffier than it would be at rest. The problem is to arrive at a determination of the material bulk density as a function of the dynamic and geometric parameters of the device, and of the burden itself. (ERA citation 08:010123)